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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.223 5 Aug 2026

/mcp is dispatchable from thin clients

Use it now

Useful4 Signal0

MCP

You can now run /mcp from thin clients where it was previously hidden.

/mcp

What

The mcp command is now available in thin clients, where it previously had no dispatch marker and was hidden.

Details

The local mcp entry is marked thinClientDispatch: "post-text"; the local-jsx entry is marked thinClientDispatch: "twin".
The availability predicate treats any workspace-requiring command with a defined thinClientDispatch as usable in a thin client.
Both "twin" and "post-text" dispatch as post-text in that environment.

Evidence

thinClientDispatch: "twin"

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.223 →